PERFORMANCE BASED DESIGN OF TALL BUILDING WITH CORNER MODIFICATION BY USING ETABS SOFTWARE
Keywords:
Tall Building, Wind Load Analysis, Storey Displacement, Corner Modification, Rounded Geometry, Chamfer Building, ETABS AnalysisAbstract
The behaviour of tall buildings under wind loads is significantly influenced by their geometric configuration, particularly the shape of building corners. This study investigates the effect of different corner modifications—namely square (base model), rounded, and chamfered (25%, 50%, and 100%)—on the wind-induced displacement of a G+21 tall building. Structural analysis is performed under load combinations 1.2 (DL + LL + WLX) and 1.2 (DL + LL + WLY), focusing on maximum storey displacement at critical elevations.
The results indicate that the Rounded Model exhibits superior performance by significantly reducing displacement in both X and Y directions. The displacement reduces from 39.35 mm to 22.17 mm in X-direction and from 18.16 mm to 9.92 mm under the respective load combinations. In Y-direction, displacement reduces from 43.93 mm to 34.71 mm and from 103 mm to 84.60 mm compared to the Base Model. These reductions correspond to 27.93%, 29.34%, 11.73%, and 9.80%, respectively, demonstrating improved aerodynamic behaviour and reduced wind pressure concentration.
In contrast, the Chamfer 25% Model shows the highest displacement, increasing from 39.35 mm to 81.48 mm and from 18.16 mm to 81.48 mm, with percentage increases of 34.86% and 77.64%, respectively. The Chamfer 50% Model increases displacement from 39.35 mm to 68.75 mm and from 18.16 mm to 68.75 mm, while the Chamfer 100% Model increases displacement from 39.35 mm to 55.85 mm and from 103 mm to 146.02 mm, indicating reduced structural efficiency due to disturbed airflow and stiffness variation.
Furthermore, the study highlights that displacement increases with building height and varies with wind direction, with higher values generally observed in the Y-direction. The findings emphasize that aerodynamic shaping plays a crucial role in enhancing the stability and serviceability of tall buildings.
Overall, the study concludes that rounded corner modification is the most effective strategy for minimizing wind-induced displacement, thereby improving structural performance and safety. These results provide valuable insights for the optimal design of tall buildings subjected to wind loads.
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